Gaseous exchange in plants takes place through the:
Correct answer: A. Stomata
- A. Stomata
- B. Mesophyll
- C. Endoderm
- D. Xylem
Explanation
The exchange of oxygen and carbon dioxide in the leaf (as well as the loss of water vapor in transpiration) occurs through pores called 'stomata' (singular = stoma). Normally, stomata open when light strikes the leaf in the morning and close during the night.
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About Respiration
The human respiratory system includes the air passages, lungs, alveoli and breathing muscles, while gaseous exchange explains how oxygen enters blood and carbon dioxide leaves it by diffusion. The effects of smoking include damage to cilia and alveoli, reduced gas exchange, chronic bronchitis, emphysema and increased risk of lung cancer.
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